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- W2052862564 abstract "The ignition characteristics of a cloud of pulverised coal flowing in a drop-tube furnace are examined.Cloud ignition is defined at the minimum gas temperature at which significant oxygen consumption occurs. This is accompanied by the generation of carbon dioxide and oxides of nitrogen, and the formation of a visual flame. Cloud ignition occurs at several hundred degrees above that for the ignition of some single coal particles. For three coals the cloud ignition temperature decreased with oxygen partial pressure, but was not sensitive to fuel equivalence ratio or particle size (as has been observed for single particles). For the three coals examined, pyrolysis measurements show the existence of a tar/light hydrocarbon/oxygenmixture at the cloud ignition temperature. On combustion the accompanying temperature increase results in coal burnoffs from 35 to 65% even though the combustible volatile matter prior to the ignition event corresponds to less than 6.5% burnoff. Different trends of tar and methane combustion and soot formation are observed in the experiments as gas temperature and oxygen levels were changed; however, significant tar combustion was always observed at cloud ignition. A mechanistic model is proposed to explain the observations." @default.
- W2052862564 created "2016-06-24" @default.
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- W2052862564 date "1994-01-01" @default.
- W2052862564 modified "2023-09-27" @default.
- W2052862564 title "Volatile matter release, particle/cloud ignition, and combustion of near-stoichiometric suspensions of pulverised coal" @default.
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- W2052862564 doi "https://doi.org/10.1016/s0082-0784(06)80677-6" @default.
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